Uni-ball Vision Elite BLX Series Stick Bold Point Rollerball Pens, Colored Ink Pens (1832404) (4-Pack of 5) Experience color like never before- differentiate yourself with the deep, rich write of BLX black infused colors Airplane Safe- ink will not explode or leak due to a change in cabin pressure during flights Exclusive uni-flow ink system regulates a steady flow of waterproof ink to the point for consistent smoothness and color intensity down to the last drop of ink Features uni Super Ink specially-formulated to become trapped in paper, helping prevent criminal check washing and other document alteration Set of 5 Colored Ink Pens includes 1 each of Brown/Black Ink, Blue/Black Ink, Red/Black Ink, Green/Black Ink Pen and Purple/Black Ink